fix: update deploy workflow for Astro site and include old static site

Author: raphbag

.github/workflows/deploy.yml

@@ -1,50 +1,94 @@
-name: Deploy Vue.js app to GitHub Pages
+# Workflow for building and deploying an Astro site to GitHub Pages
+# plus inclusion du site statique de la branche `old` dans /old
+
+name: Deploy Astro + Old site to GitHub Pages
 
 on:
   push:
-    branches:
-      - vue  # Déploie quand tu pousses sur la branche 'vue'
+    branches: ["master"]
   workflow_dispatch:
 
 permissions:
   contents: read
   pages: write
   id-token: write
 
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+env:
+  BUILD_PATH: "." # dossier du site Astro
+
 jobs:
   build:
+    name: Build Astro site + include old version
     runs-on: ubuntu-latest
-
     steps:
-      - name: Checkout repository
+      - name: Checkout master (Astro site)
         uses: actions/checkout@v4
+        with:
+          ref: master
+
+      - name: Detect package manager
+        id: detect-package-manager
+        run: |
+          if [ -f "${{ github.workspace }}/yarn.lock" ]; then
+            echo "manager=yarn" >> $GITHUB_OUTPUT
+            echo "command=install" >> $GITHUB_OUTPUT
+            echo "runner=yarn" >> $GITHUB_OUTPUT
+            echo "lockfile=yarn.lock" >> $GITHUB_OUTPUT
+          elif [ -f "${{ github.workspace }}/package.json" ]; then
+            echo "manager=npm" >> $GITHUB_OUTPUT
+            echo "command=ci" >> $GITHUB_OUTPUT
+            echo "runner=npx --no-install" >> $GITHUB_OUTPUT
+            echo "lockfile=package-lock.json" >> $GITHUB_OUTPUT
+          else
+            echo "Unable to determine package manager"
+            exit 1
+          fi
 
-      - name: Setup Node.js
+      - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 18  # Compatible avec Vue 3/Vite
-          
+          node-version: "20"
+          cache: ${{ steps.detect-package-manager.outputs.manager }}
+          cache-dependency-path: ${{ env.BUILD_PATH }}/${{ steps.detect-package-manager.outputs.lockfile }}
+
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5
-        
+
       - name: Install dependencies
-        run: npm install
+        run: ${{ steps.detect-package-manager.outputs.manager }} ${{ steps.detect-package-manager.outputs.command }}
+        working-directory: ${{ env.BUILD_PATH }}
+
+      - name: Build Astro site
+        run: |
+          ${{ steps.detect-package-manager.outputs.runner }} astro build \
+            --site "${{ steps.pages.outputs.origin }}" \
+            --base "${{ steps.pages.outputs.base_path }}"
+        working-directory: ${{ env.BUILD_PATH }}
+
+      - name: Clone old branch (static site)
+        run: |
+          git clone --depth 1 --branch old https://github.com/${{ github.repository }} tmp-old
+          mkdir -p ${{ env.BUILD_PATH }}/dist/old
+          cp -r tmp-old/* ${{ env.BUILD_PATH }}/dist/old/ || true
+          rm -rf tmp-old
 
-      - name: Build project
-        run: npm run build
-      
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with:
-          path: ./dist
+          path: ${{ env.BUILD_PATH }}/dist
 
   deploy:
-    needs: build
-    runs-on: ubuntu-latest
+    name: Deploy to GitHub Pages
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
+    needs: build
+    runs-on: ubuntu-latest
     steps:
       - name: Deploy to GitHub Pages
         id: deployment